Finally, a useful tip. How do you say in Spanish "It's your fault?" Unless you are playing soccer with your friends, you shouldn't say "es tu falta." For that, Spanish uses the word culpa (guilt, blame). It may sound really extreme and weird to say "it's your guilt" in English, but es tu culpa is common in Spanish:

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Finally, another use of the word falta is in the expression faltas de ortografía (orthographic mistakes). You can combine it with the verb tener (to have) as in el ensayo tiene muchas faltas de ortografía (the essay has many orthographic mistakes), or with the verb cometer (to commit, to make) as in tú cometes muchas faltas de ortografía (you make a lot of ortographic mistakes). Thank you for reading!